I have a Sailrite 111/MC-SCR Power System. I got mine with the table/oil pan. I asked about quilting & was told their machines are not designed to sew light fabrics. The feed dogs are too heavy & will chew the fabrics up. The added MC-SCR Power System allows me to sew 1 stitch at a time if I want to. I have sewn many very thick new fabrics/items including repairing many items with very thick seams. I have a walking foot, zipper feet, cording foot. I've not had any problems with tension. It is designed to use heavy needles & threads.